• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.8
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• pp.1051-1057
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• 2013

In this study, an automatic surface-strain measurement system called "ASIAS-bio" has been developed. This system can be used even in cases in which it is very difficult to apply a regular grid pattern necessary for measuring surface-strain, such as curved or uneven surfaces; surfaces damaged by corrosion or contamination; or soft materials such as rubber, foam, and biological tissues. This system works independently of the measurement conditions including the material and its surface condition, grid pattern and size, grid marking method, and degree of deformation. A comparison between the strain distributions of the sheet metal parts measured by using this system and those obtained by a commercial system showed that this system was sufficiently reliable. In addition, the deformation of the swine joint capsule and human knee skin was measured by using this system to demonstrate its usefulness.

• Proceedings of the Korean Statistical Society Conference
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• 2000.11a
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• pp.201-205
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• 2000

사회적 연결망 분석은 사회학에서 양적 분석방법과 질적 분석방법이 함께 안고 있는 문제, 즉 사회적 실체를 관계에 우선하여 측정하고 분석함으로써, 사회적 관계가 부차적이고 파생적으로 인식되는 문제를 해결하는 방안으로 제안되었다. 연결망 분석은 개인 혹은 집단과 조직간의 관계에 대한 형식적 접근을 통해 그 전반적 혹은 부분적 특성을 분석하는 방법으로, 사회적 구조의 발현적 속성에 초점을 맞춘다. 조직간의 연결망에 대한 분석을 통해 조직의 성과가 조직 자체의 속성 뿐 아니라 조직간의 관계의 속성에 의존함이 밝혀졌다.

• The Journal of Korean Society for Radiation Therapy
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• v.16 no.1
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• pp.57-65
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• 2004

Introduction : The phantom that includes high density materials such as steel was custom-made to fix lung and bone in order to evaluation inhomogeneity correction at the time of conducting radiation therapy to treat lung cancer. Using this, values resulting from the inhomogeneous correction algorithm are compared on the 2 and 3 dimensional radiation therapy planning systems. Moreover, change in dose calculation was evaluated according to inhomogeneous by comparing with the actual measurement. Materials and Methods : As for the image acquisition, inhomogeneous correction phantom(Pig's vertebra, steel(8.21g/cm3), cork(0.23 g/cm3)) that was custom-made and the CT(Volume zoom, Siemens, Germany) were used. As for the radiation therapy planning system, Marks Plan(2D) and XiO(CMS, USA, 3D) were used. To compare with the measurement value, linear accelerator(CL/1800, Varian, USA) and ion chamber were used. Image, obtained from the CT was used to obtain point dose and dose distribution from the region of interest (ROI) while on the radiation therapy planning device. After measurement was conducted under the same conditions, value on the treatment planning device and measured value were subjected to comparison and analysis. And difference between the resulting for the evaluation on the use (or non-use) of inhomogeneity correction algorithm, and diverse inhomogeneity correction algorithm that is included in the radiation therapy planning device was compared as well. Results : As result of comparing the results of measurement value on the region of interest within the inhomogeneity correction phantom and the value that resulted from the homogeneous and inhomogeneous correction, gained from the therapy planning device, margin of error of the measurement value and inhomogeneous correction value at the location 1 of the lung showed $0.8\%$ on 2D and $0.5\%$ on 3D. Margin of error of the measurement value and inhomogeneous correction value at the location 1 of the steel showed $12\%$ on 2D and $5\%$ on 3D, however, it is possible to see that the value that is not correction and the margin of error of the measurement value stand at $16\%$ and $14\%$, respectively. Moreover, values of the 3D showed lower margin of error compared to 2D. Conclusion : Revision according to the density of tissue must be executed during radiation therapy planning. To ensure a more accurate planning, use of 3D planning system is recommended more so than the 2D Planning system to ensure a more accurate revision on the therapy plan. Moreover, 3D Planning system needs to select and use the most accurate and appropriate inhomogeneous correction algorithm through actual measurement. In addition, comparison and analysis through TLD or film dosimetry are needed.

• Journal of Korean Academy of Nursing Administration
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• v.5 no.2
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• pp.401-414
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• 1999

향후 더욱 경쟁적인 상황에 놓이게 될 보천의료 분야에 능동적으로 대처하기 위한 방안의 하나로서 보건의료 조직은 간호부서의 성과 향상을 위한 노력을 지속적으로 기울이고 있다. 이러한 성과 향상을 위한 노력은 정확한 성과의 측정이 함께 이루어질 때 가능하게 된다. 간호서비스의 성과 측정은 여러 각도에서 조명되고 측정이 이루어져야하며 간호관리자는 총괄적인 성과측정시스템에 대한 새로운 인식과 사전 준비작업으로 무장을 하여야 한다. 이러한 요구에 맞추어, 본 논문은 간호 서비스의 성과측정방법에 대한 고찰, 즉 생산성, 효율성, 간호의 질, 수익성. quality of work life에 대한 간호분야에서의 접근방법을 재정리하고, 새로운 총괄적인 성과측정방법의 개념을 제시한다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1995.09a
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• pp.249-263
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• 1995

본 연구는 비즈니스 프로세스 리엔지니어링(Business Process Reengineering : BPR)의 분야에서 제기되고 있는 여러 가지 지침들을 종합.분석하였다. BPR 구축을 위한 단계를 분석(Analysis), 재설계(Redesign), 실행 (Implementation)으로 구분하여 각 단계별 지침들을 분석하였으며, 이러한 지침들이 조직구성요소중 어떤 요소에 영향을 미치는지를 분석하였다. 또한 각 단계의 지침들이 비즈니스 프로세스 리엔지니어링을 통하여 개선하고자 하는 성과 측정의 주요 요소인 품질(Quality), 비용(Cost), 속도(Speed), 서비 스(Service)의 측면에서 어떤 요소에 영향을 미치는지를 파악하였다. 이를 통 하여 BPR 구축의 기본적인 틀과 구조적 지침을 제시하고 있으며, 향후의 실 제적 적용 및 연구들이 나아가야 갈 방향을 제시하고 있다. 본 연구를 통하 여 기존의 연구에 대한 현황과 한계를 발견하였다. 첫째, 기존의 많은 연구 들은 BPR의 재설계 측면을 위주로 한 연구이며, 구체적이고 실천적인 지침 들을 제시하지 못하고 있다. 둘째, 실행단계에서는 주로 추상적인 지침들을 제시하고 있다. 셋째, 재설계 단계에서는 조직의 문화적인 측면이 별로 고려 되지 않고 있다. 넷째, 성과 측정의 관점에서 볼때 BPR 지침들은 특히 비용 절감을 위한 목표를 달성할 수 있는 지침들의 제시가 부족한 실정이다. 또한 조직환경, 조직구조, 조직문화와 같은 조직의 특수한 상황에 적합한 연구가 아닌 일반적인 지침들만을 제시하고 있어 BPR을 추진하는 조직 및 기업에 서 그 지침들의 효과가 매우 제한된다.

• Journal of the Korea Convergence Society
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• v.6 no.4
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• pp.55-64
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• 2015

The purpose of this study is to analyze the relationship between the safety, working condition and the organizational commitment among crews members of airline companies in Korea. The data were collected from 230 employees of the a private airline company who gave their informed consent and completed a self-reported questionnaire in November, 2014. A structural equation model was established. The fitness of the hypothetical model was adequate (${\chi}^2=88.424$, df=48, RMR=0.044, GFI=0.940, CFI=0.964, NFI=0.926, IFI=0.965). Analysis of the hypothetical model demonstrated that effects of safety, working condition were significantly correlated with organizational justice and organizational commitment. The results of this study indicate that it is necessary to develop a safety program and working condition to encourage better organizational commitment of the pilot, leading to a brighter future for domestic airline business.

• Progress in Medical Physics
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• v.9 no.4
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• pp.247-257
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• 1998

For effective radiotherapy, it should always be considered that calculation of different dose distribution in heterogenous tissue is important particularly on lung which has low density and large volume. To take precise dose distribution of 6MV X-ray in the thoracic cage, the authors had made a tissue equivalent phantom for thorax, measured dose distribution by thermoluminescent dosimeter and mm dosimeter, and derived methmetical equation coincided with provided theoretical formula. In comparision with isodose curve on case of homogeneous soft tissue, dose of heterogeneous lung tissue had been shown increase about 4% per cm depth on one and multiportal field, less than 15% difference on rotation field for esophagus, and around 20% difference on rotation field for lung according to the degree of rotation angle that must be corrected by dose compensation.

• Journal of Radiation Protection and Research
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• v.27 no.1
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• pp.37-49
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• 2002

The accuracy of radiation dose delivery to target volume is one of the most important factors for good local control and less treatment complication. In vivo dosimetry is an essential QA procedure to confirm the radiation dose delivered to the patients. Transmission dose measurement is a useful method of in vivo dosimetry and it's advantages are non-invasiveness, simplicity and no additional efforts needed for dosimetry. In our department, in vivo dosimetry system using measurement of transmission dose was manufactured and algorithms for estimation of transmission dose were developed and tested with phantom in various conditions successfully. This system was applied in clinic to test stability, reproducibility and applicability to daily treatment and the accuracy of the algorithm. Transmission dose measurement was performed over three weeks. To test the reproducibility of this system, X-tay output was measured before daily treatment and then every hour during treatment time in reference condition(field size; $10 cm{\times} 10 cm$, 100 MU). Data of 11 patients whose pelvis were treated more than three times were analyzed. The reproducibility of the dosimetry system was acceptable with variations of measurement during each day and over 3 week period within ${\pm}2.0%$. On anterior- posterior and posterior fields, mean errors were between -5.20% and +2.20% without bone correction and between -0.62% and +3.32% with bone correction. On right and left lateral fields, mean errors were between -10.80% and +3.46% without bone correction and between -0.55% and +3.50% with bone correction. As the results, we could confirm the reproducibility and stability of our dosimetry system and its applicability in daily radiation treatment. We could also find that inhomogeneity correction for bone is essential and the estimated transmission doses are relatively accurate.

• Korean Journal of Food Science and Technology
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• v.30 no.5
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• pp.1077-1084
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• 1998

The optimum conditions fer the measurement of texture profile of imitation crab-leg products were investigated by different conditions using Texture Analyser and the date were compared to those of sensory evaluations. The textural characteristics of surimi gels were compared with those of imitation crab-leg products. The TPA values of 5 different kinds of commercial imitation crab-leg product and 2 kinds of surimi gel products purchased in a market in Seoul were measured. In surimi gels, instrumental hardness and cohesiveness were higher than those of imitation crab-leg products, especially chewiness and gumminess were significantly higher than those of imitation crab-leg products. In imitation crab-leg products, hardness and cohesiveness increased and springiness decreased as the probe diameter increased from 12.5 mm to 24.6 mm. In the different compression ratio (60, 70, 80%), hardness increased and cohesiveness and springiness decreased as the compression ratio increased. The chewiness, gumminess, cohesiveness and hardness increased slightly as the cross-head speed increased from 0.8 to 2.4 mm/sec. Significant correlations between mechanical and sensory values were observed in gumminess, chewiness, cohesiveness and hardness. The optimum conditions for the TPA measurement of imitation crab-leg products were a cross-head speed of 2.4 mm/sec and 60% compression ratio with a flat probe having twice of the sample diameter (24.6 mm).

• KSBB Journal
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• v.9 no.3
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• pp.319-324
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• 1994

A biosensor for the measurement of malate has been constructed by the sodium-alginate immobilized bundle sheath cell tissue of corn leaf containing malate dehydrogenase (decarboxylating) (EC 1. 1. 1. 40) on the CO2 gas-sensing electrode. The proposed tissue sensor had the linear in the range of malate concentration $5.5{\times}10^{-5}M∼2.5{\times}10^{-2}M$ with a slope of 53.5 mV/decade in 0.02M Tris-HCl buffer solution at optimum pH 8.0, and $25^{\circ}C$. A response time was 16∼18min. The present L-malate sensing tissue sensor is stable for more than one week. At pH 7.4, Km value was $0.6{\times}10^{-5}M$. The various kinds of salt did not effect the signal of malate tissue biosensor as the inhibitor. We can measure the malate by the CO2 electrode at the pH=8.0. Thus, the proposed tissue sensor will be useful for the measurement of malate.